Case Presentation: A 59-year-old female with prior pulmonary embolus and breast cancer presented for outpatient retinal detachment repair. In PACU, O2 saturations were 80%, and she was admitted for further workup. She reported 2 weeks of dyspnea on exertion with productive cough, but denied fever, congestion, chest pain, hemoptysis, dyspnea at rest, weight changes, lower [...]